ACCESS TRACK AND BRIDGE AT CORS ERDDREINIOG NNR, ANGLESEY

Descriptions

Design and build new timber bridge, access track and erosion repair at Cors Erddreiniog NNRThe Contract is to design supply and construct a timber decked bridge capable of carrying a 12tonne load, the excavation of an access track up to the bridge and the installation of gabion mattresses to prevent erosion scouring.BRIDGE SPECIFICATION f.The bridge is to replace the existing collapsed culvert.g.The bridge is to be designed, by an experienced design engineer, to the following specification and is to be capable of supporting a 12 tonne load from a tracked excavator.h.Bridge abutments to be durable timber driven piles, capable of supporting the implied loading.i.Bridge to be 5m long and 3m wide.j.Sub structure of bridge to be galvanised I beams capable of supporting the imposed loading.k.FSC approved Oak decking to bridge, complete with anti slip treatment to the surface.l.Bridge parapets to be post and rail in oak, and to be 100mm above bridge deck.m.All fastenings and fixings to be galvanised and all timber to be FSC approved.TRACK WORKS•The track leading from the gate to the bridge has a hardcore sub base, but over the years ditching spoil has been deposited over the track. It will therefore be necessary to reduce the levels down to the hardcore. Allow for depth of 300mm of reduced excavation. The excavated material from the reduced dig will be deposited on the existing berm to increase its height, and shaped to the existing profile.•Import hardcore, spread and level on to 1200 gauge geotextile membrane to top up levels on existing track. Hardcore to be 75mm down and obtained from the CMP local limestone quarry in Brynteg.